US PATENT SUBCLASS 338 / 118
.~ Movable contact electrically adjustable over length of resistance element

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

68  DF  MECHANICALLY VARIABLE (E.G., RHEOSTAT) {24}
118.~ Movable contact electrically adjustable over length of resistance element {21}
119  DF  .~.~> With contact position indicating lamp
120  DF  .~.~> Additional resistor adjustably shunts part of resistance element (e.g., varifunction type
121  DF  .~.~> With nonlinearity correction
122  DF  .~.~> Coarse and fine resistance elements {1}
125  DF  .~.~> Unitary movable contact electrically bridges plural resistance elements {2}
128  DF  .~.~> Plural {3}
135  DF  .~.~> With zero setting or phasing
136  DF  .~.~> Contact clamped on resistance element
137  DF  .~.~> Plural contacts adjustable over single resistance element
138  DF  .~.~> Element tapered {4}
143  DF  .~.~> Contact moves along turns of helical resistance element {6}
150  DF  .~.~> Resistance element moves {2}
153  DF  .~.~> Contact operated by pedal or treadle
154  DF  .~.~> With a flexible conductive strip separating the movable contact and the resistance element or taps
155  DF  .~.~> Contact rocks along element or taps
156  DF  .~.~> With liquid contact
157  DF  .~.~> Contact rolls along element or taps {1}
159  DF  .~.~> With heat conducting or distributing path
160  DF  .~.~> Contact slides along in contact with element {3}
184  DF  .~.~> With housing
185  DF  .~.~> With intervening connector between contact and element (e.g., taps) {6}

DEFINITION

Classification: 338/118

(under subclass 68) Subject matter wherein the resistance element has an elongated shape, or a plurality of resistance elements are connected in a series, which shape or series may be straight or curved, together with at least two conducting terminals, electrically connected to the element by direct connection or through one of a plurality of intervening connecting structures each electrically connected to the element or series of elements along the length, one of the terminals forming a contact for the element and being movable along the length of the element or selectively among the plurality of intervening connecting structures to constitute a contact or contacts for the element or intervening portion to enable an adjustable portion of the length of the element or elements to be electrically connected between the terminals, the resistance value of the portion thus depending on the position or setting of the movable terminal or terminals.

(1) Note. The path of motion of the terminals need not be

fixed for classification here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

70+, for a mechanically variable resistor in or on a lamp socket.

117, for mechanically variable resistors having slidable helical and linear contacts.

200+, for a variable resistor including a switch. 202, for movable contact structure for variable resistors and not otherwise classifiable.

215, for a fixed resistor together with a switch.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers, especially

4, 6+ and 16 for multiple circuit control switches with movable contacts.